function echeck(emailStr) {

var checkTLD=1;
var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
var emailPat=/^(.+)@(.+)$/;
var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
var validChars="\[^\\s" + specialChars + "\]";
var quotedUser="(\"[^\"]*\")";
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

var atom=validChars + '+';
var word="(" + atom + "|" + quotedUser + ")";

var userPat=new RegExp("^" + word + "(\\." + word + ")*$");


var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");


var matchArray=emailStr.match(emailPat);

if (matchArray==null) {


alert("Email address seems incorrect (check @ and .'s)");
return false;
}
var user=matchArray[1];
var domain=matchArray[2];


for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
alert("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Ths domain name contains invalid characters.");
return false;
   }
}

// See if "user" is valid 

if (user.match(userPat)==null) {

// user is not valid

alert("The username doesn't seem to be valid.");
return false;
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {

// this is an IP address

for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
alert("Destination IP address is invalid!");
return false;
   }
}
return true;
}

// Domain is symbolic name.  Check if it's valid.
 
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
alert("The domain name does not seem to be valid.");
return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
alert("The address must end in a well-known domain or two letter " + "country.");
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
alert("This address is missing a hostname!");
return false;
}

// If we've gotten this far, everything's valid!
return true;
}


function validate_frm(){
		frm = document.form1;
		if(frm.txtusername.value==""){
			alert("Please Enter your Name");
			frm.txtusername.value=""
			frm.txtusername.focus()
			return false;
		}
		var temp='';
		temp = frm.txtusername.value;		
		if(!isNaN(temp)){
			alert("Please Enter Valid Name")
			frm.txtusername.value=""
			frm.txtusername.focus()
			return false			
		}
		if(frm.txtcontact.value==""){
		alert("Please Enter Contact No");		
		frm.txtcontact.focus()
		return false;
		}
		var temp='';
		temp = frm.txtcontact.value;		
		if(isNaN(temp)){
			alert("Please Enter Valid Contact No")
			frm.txtcontact.value=""
			frm.txtcontact.focus()
			return false			
		}

		var emailID=frm.email_address;		
		if ((emailID.value==null)||(emailID.value=="")){
			alert("Please Enter your Email ")
			emailID.focus()
			return false
		}
		if (echeck(emailID.value)==false){
			emailID.value=""
			emailID.focus()
			return false
		}	
		
		if(frm.txtcity.value==""){
		alert("Please Enter City");		
		frm.txtcity.focus()
		return false;
		}
		var temp='';
		temp = frm.txtcity.value;		
		if(!isNaN(temp)){
			alert("Please Enter Valid City")
			frm.txtcity.value=""
			frm.txtcity.focus()
			return false			
		}

		if(frm.txtstate.value==""){
		alert("Please Enter State");		
		frm.txtstate.focus()
		return false;
		}
		var temp='';
		temp = frm.txtstate.value;		
		if(!isNaN(temp)){
			alert("Please Enter Valid State")
			frm.txtstate.value=""
			frm.txtstate.focus()
			return false			
		}

		
		frm.submit();
}